These natural beads are made using dried lava, formed from molten rock originating from a volcano eruption. They come in a variety of shapes and sizes. Although they are considered to be a form of stone, they are fairly lightweight making them great for jewelry. They look very earthy and our customers tell us they are great for oil infusions! Multiple strands pictured. Each strand sold individually. Each bead measures approximately 7 x 8mm with a hole size of approximately 1mm. You will receive a full strand measuring approximately 16".